Looks like the website is a bit out of date. It meets every week, but they don't always book a table with the pub. If you are new I would wait until about 7:15 as it will be more obvious who the group are.
The Ivy House group meets every monday. This week there were 5 knitters and one dog No one was crocheting but there are some weeks.
Not local but this place in Bromley glades is friendly https://www.greenerandcleaner.co.uk/events/